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Process for manufacturing 17-4PH Martensite precipitation-hardening stainless steel forgings

A precipitation hardening and manufacturing process technology, applied in the field of manufacturing process of 17-4PH martensitic precipitation hardening stainless steel forgings, can solve the problems of high product scrap rate, reduce steel forgeability, affect steel structure and performance, etc. Low scrap rate, good effect of improving plasticity, organization and performance

Inactive Publication Date: 2012-11-14
ZHANGJIAGANG HAIGUO HEAVY FORGING
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Problems solved by technology

However, during the forging process of this kind of steel, the heat treatment temperature control requirements are quite strict, and the forgeability of the steel is often greatly reduced due to the appearance of brittle δ-ferrite, which affects the structure and performance of the steel, and the product scrap rate is high.

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  • Process for manufacturing 17-4PH Martensite precipitation-hardening stainless steel forgings

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Embodiment Construction

[0010] The manufacturing process of the 17-4PH martensitic precipitation-hardening stainless steel forging of the present invention will be further described in detail through specific examples below.

[0011] Such as figure 1 As shown, the manufacturing process of 17-4PH martensitic precipitation hardening stainless steel forgings includes the following steps:

[0012] Quenching: First, heat the workpiece to 650±10°C for the first heat preservation. The first heat preservation time is proportional to the thickness of the workpiece. When the thickness of the workpiece is 1 inch, the heat preservation time is 0.5 to 1 hour. After a period of time, heat the workpiece to 1050±5°C for the second heat preservation. The second heat preservation time is proportional to the thickness of the workpiece. When the thickness of the workpiece is 1 inch, the heat preservation time is 0.5 to 1 hour. After a period of time, put the workpiece into water for static water cooling until the tempe...

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Abstract

The invention relates to a process for manufacturing 17-4PH Martensite precipitation-hardening stainless steel forgings. The process comprises the following steps of: quenching: firstly, raising the temperature of a workpiece to be 650 plus or minus 10 DEG C for carrying out heat preservation for the first time, raising the temperature of the workpiece to be 1,050 plus or minus 5 DEG C for carrying out heat preservation for the second time after the heat preservation for the first time is carried out for a long time, performing stationary air cooling on the workpiece in the water until the temperature of the workpiece is not more than 32 DEG C after the heat preservation for the second time is carried out for a long time; tempering for the first time: raising the temperature of the cooled workpiece to be 620 plus or minus 5 DEG C for carrying out heat preservation for the third time, and air-cooling the workpiece after the heat preservation for the third time is carried out for a long time; and tempering for the second time: raising the temperature of the workpiece subjected to the tempering for the first time to be 590 plus or minus 5 DEG C for carrying out heat preservation for the fourth time; furnace-cooling the workpiece after the heat preservation to be 400 DEG C after the heat preservation of the fourth time is carried out for a long time; and air-cooling the workpiece to prepare the forgings.

Description

technical field [0001] The invention relates to a manufacturing process of a 17-4PH martensitic precipitation hardening stainless steel forging. Background technique [0002] 17-4PH steel is a martensitic precipitation hardening stainless steel containing Nb. Its corrosion resistance and forgeability are better than ordinary martensitic stainless steel. It is widely used in offshore oil with high requirements for high temperature resistance and corrosion resistance. , engine, chemical and other industries, the market demand is large. However, in the forging process of this kind of steel, the heat treatment temperature control is quite strict, and the forgeability of the steel is often greatly reduced due to the appearance of brittle δ-ferrite, which affects the structure and performance of the steel, and the product scrap rate is high. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a manufacturing process of 17...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 王松林
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING
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